1590BB · 7 knobs
Torivor PreampA Dual Channel LM386 Amp in a Box
- Category
- Preamp / Amp-in-a-box
- Price
- see vendor
From the vendor
I generally don't do projects that fall in the boost/OD/dirt category. Part of that is because I'm a bit of an addict and have a bunch already. The other part is that there are so many of them. Everyone and their dog has “designed” a dirt pedal. They also aren't particularly challenging from a technical standpoint, so I tend to focus on other types of projects. However, one of my favorite drives is an LM386-based unit, but the tone control is one of those kind of lame, single-knob, adjustable-cutoff frequency RC filter types. The dirt is great, but the tone shaping is somewhat lacking. I decided that I wanted to do my own take on an LM386 circuit, including a full tone stack and the ability to do both clean and dirty tones with it.
Schematic
The schematic is in the vendor's build document, page 1. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 58 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| R1 | 1M | 1M | ||
| R2 | 100k | 100k | ||
| R3 | 1k8 | 1.8k | ||
| R4 | 4k7 | 4.7k | ||
| R5 | 100k | 100k | ||
| R6 | 1k8 | 1.8k | ||
| R7 | 10k | 10k | ||
| R10 | 150R | 150 | ||
| R11 | 1M | 1M | ||
| R12 | 100R | 100 | ||
| Capacitors 12 | ||||
| C1 | 100n | 100n | ||
| C2 | 47u | 47u | ||
| C3 | 2n2 | 2.2n | ||
| C4 | 470n | 470n | ||
| C5 | 1u | 1u | ||
| C6 | 47u | 47u | ||
| C7 | 100n | 100n | ||
| C8 | 1u | 1u | ||
| C9 | 10u | 10u | ||
| C10 | 4n7 | 4.7n | ||
| C11 | 47u | 47u | ||
| C12 | 100u | 100u | ||
| Diodes 1 | ||||
| D1 | 1N400x, 1N5817 | 1N400X / 1N5817 | ||
| Transistors 4 | ||||
| Q1 | 2N5457 | 2N5457 | ||
| Q2 | 2N5457 | 2N5457 | ||
| Q3 | MMBFJ201 | MMBFJ201 | ||
| Q4 | MMBFJ201 | MMBFJ201 | ||
| ICs 1 | ||||
| IC1 | LM386 | LM386 | ||
| Potentiometers 7 | ||||
| BASS | 25kB | B25k | ||
| CLN_GAIN | 1kC | C1k | ||
| CLN_VOL | 100kA | A100k | ||
| DIRT_VOL | 100kA | A100k | ||
| GAIN | 100kA | A100k | ||
| MID | 2kB | B2k | ||
| TREB | 25kB | B25k | ||
| Trimmers 4 | ||||
| BIAS1 | 100k | 100k | Trimmer | |
| BIAS2 | 100k | 100k | Trimmer | |
| C_TRIM | 100k | 100k | Trimmer | |
| RLED | Trimmer | |||
| Switches 2 | ||||
| SW | LSP10 | LSP10 | ||
| VOICE | SPDT | SPDT | ||
| LEDs 2 | ||||
| D2 | LED | LED | ||
| LED | LSP10 | LSP10 | ||
| Other 15 | ||||
| +9V | LSP10 | LSP10 | ||
| CHAN | LSP10 | LSP10 | ||
| CHAN_A1 | LSP10 | LSP10 | ||
| CHAN_A2 | LSP10 | LSP10 | ||
| CHAN_A3 | LSP10 | LSP10 | ||
| CHAN_B1 | LSP10 | LSP10 | ||
| CHAN_B3 | LSP10 | LSP10 | ||
| CHAN_C1 | LSP10 | LSP10 | ||
| CHAN_C2 | LSP10 | LSP10 | ||
| CHAN_C3 | LSP10 | LSP10 | ||
| GND | LSP10 | LSP10 | ||
| GND_IN | LSP10 | LSP10 | ||
| GND_OUT | LSP10 | LSP10 | ||
| IN | LSP10 | LSP10 | ||
| OUT | LSP10 | LSP10 | ||